dtrace discuss - Sep 2009 - pid$provider appearing and disappearing

Hi,

My knowledge of dtrace is not very large.
Perhaps someone kan explain why at some point of time I see when executing
dtrace -l provider pid24230 (24230 is a java process) and some time later it has
disappeared whereas the process 24230 still exists?!

Regards Hans
-- 
This message posted from opensolaris.org

Hi Hans,
> Perhaps someone kan explain why at some point of time I see when executing
> dtrace -l provider pid24230 (24230 is a java process) and some time later
it
> has disappeared whereas the process 24230 still exists?!
I''m not sure I understand the scenario you''re describing. Can
you show the
output you''re seeing? Can you describe the change you''re
seeing that you
believe to be in error?

Adam

-- 
Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl

Hi Adam,

It is not that I think that there is something in error but just my lack
of knowledge I think.
I am an Oracle dba trespassing on dtrace territory.

At some point of time dtrace -l would show the lines below (among
others)
61194   pid24230              java                            _start
entry
61195   pid24230              java                              main
entry
61196   pid24230              java                      CheckJvmType
entry
61197   pid24230              java                          MemAlloc
entry
61198   pid24230              java                      ReadKnownVMs
entry
61199   pid24230              java                           GetArch
entry
61200   pid24230              java        CreateExecutionEnvironment
entry
61201   pid24230              java                        LoadJavaVM
entry 

Sometime later these were not present anymore.

BTW is there perhaps something like a dtrace course?
I want to dtrace java with djvm/dvm Provider .

Regards Hans-Peter

-----Original Message-----
From: Adam Leventhal [mailto:ahl at eng.sun.com] 
Sent: Friday, September 11, 2009 20:31
To: Sloot, Hans-Peter
Cc: dtrace-discuss at opensolaris.org
Subject: Re: [dtrace-discuss] pid$provider appearing and disappearing

Hi Hans,
> Perhaps someone kan explain why at some point of time I see when 
> executing dtrace -l provider pid24230 (24230 is a java process) and 
> some time later it has disappeared whereas the process 24230 still
exists?!

I''m not sure I understand the scenario you''re describing. Can
you show
the output you''re seeing? Can you describe the change you''re
seeing that
you believe to be in error?

Adam

-- 
Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl

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Hi Hans-Peter,

pid provider probes are created on demand. If the system is running  
low on probes (there''s a limit) it will start culling old and unused  
probes. You can recreate them by specifying them in a dtrace(1M)  
invocation.

Adam

On Sep 13, 2009, at 3:24 PM, Sloot, Hans-Peter wrote:
> Hi Adam,
>
> It is not that I think that there is something in error but just my  
> lack
> of knowledge I think.
> I am an Oracle dba trespassing on dtrace territory.
>
> At some point of time dtrace -l would show the lines below (among
> others)
> 61194   pid24230              java                            _start
> entry
> 61195   pid24230              java                              main
> entry
> 61196   pid24230              java                      CheckJvmType
> entry
> 61197   pid24230              java                          MemAlloc
> entry
> 61198   pid24230              java                      ReadKnownVMs
> entry
> 61199   pid24230              java                           GetArch
> entry
> 61200   pid24230              java        CreateExecutionEnvironment
> entry
> 61201   pid24230              java                        LoadJavaVM
> entry
>
> Sometime later these were not present anymore.
>
> BTW is there perhaps something like a dtrace course?
> I want to dtrace java with djvm/dvm Provider .
>
> Regards Hans-Peter
>
> -----Original Message-----
> From: Adam Leventhal [mailto:ahl at eng.sun.com]
> Sent: Friday, September 11, 2009 20:31
> To: Sloot, Hans-Peter
> Cc: dtrace-discuss at opensolaris.org
> Subject: Re: [dtrace-discuss] pid$provider appearing and disappearing
>
> Hi Hans,
>
>> Perhaps someone kan explain why at some point of time I see when
>> executing dtrace -l provider pid24230 (24230 is a java process) and
>> some time later it has disappeared whereas the process 24230 still
> exists?!
>
> I''m not sure I understand the scenario you''re describing.
Can you show
> the output you''re seeing? Can you describe the change
you''re seeing
> that
> you believe to be in error?
>
> Adam
>
> -- 
> Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl
>
> <disclaimer.txt>

--
Adam Leventhal, Fishworks                        http://blogs.sun.com/ahl